What is CVE-2026-21999?

CVE-2026-21999 is a medium-severity vulnerability in Oracle Xml_database, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-21.

How severe is CVE-2026-21999?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Oracle Xml_database

CVE-2026-21999

Vulnerability in the XML Database component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTPS to compromise…

Vulnerability class: Information Disclosure

EPSS: 0.002 (15.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Oracle Xml_database
Oracle Corporation Database Server — versions 23.4.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

secalert_us@oracle.com (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21999?: CVE-2026-21999 is a medium-severity vulnerability in Oracle Xml_database, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-21.
How severe is CVE-2026-21999?: Medium severity. CVSS v3 base score is 5.3 out of 10.